Sanritsu (hidden data)
From Game Developer Research Institute
Flash Point (MD)
"PROGRAMED BY DR EBAKO" (likely referring to Naoki Okabe) appears in the ROM. It is unknown if it ever appears on-screen.
Tetris (MD)
"PROGRAMED BY NAOKI OKABE" appears in the ROM with the title screen text but does not appear on-screen.
The book "Goodbye Soft" says this was going to be developed by Sanritsu Denki. [1]